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If you have not explicitly set a domain, the graph tool will choose one for you.
Cartesian and inverse graphs have a domain implied by the size of the axes and the graph tool will automatically draw a graph for this implied domain.
Polar and parametric graphs have no implied domain so the graph tool uses:
Polar graphs 0 ≤ θ ≤ 360 (degrees mode)
0 ≤ θ ≤ 2π (radian mode)
Parametric graphs 0 ≤ τ ≤ 20
If your polar or parametric graph is incomplete, you may need to set your own domain.